:root {
    --bg: #0f1420;
    --bg-soft: #171d2e;
    --card: #1c2337;
    --card-hover: #232b44;
    --border: #2b3450;
    --text: #e8ecf6;
    --text-muted: #8b94ad;
    --primary: #4f7cff;
    --primary-hover: #3b66e6;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    --radius: 12px;
    --shadow: 0 8px 24px rgba(0,0,0,0.25);
    --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ---------- Layout ---------- */
.layout { display: flex; min-height: 100vh; }

.sidebar {
    width: 250px;
    background: var(--bg-soft);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 50;
    transition: transform 0.25s ease;
}

.sidebar-brand {
    display: flex; align-items: center; gap: 10px;
    padding: 20px 20px; font-size: 20px; font-weight: 700;
    color: var(--text); border-bottom: 1px solid var(--border);
}
.sidebar-brand svg { color: var(--primary); flex-shrink: 0; }

.sidebar-nav { flex: 1; padding: 16px 12px; display: flex; flex-direction: column; gap: 4px; }

.nav-link {
    display: flex; align-items: center; gap: 12px;
    padding: 11px 14px; border-radius: 8px;
    color: var(--text-muted); text-decoration: none;
    font-size: 14px; font-weight: 500;
    transition: background 0.15s, color 0.15s;
}
.nav-link svg { flex-shrink: 0; }
.nav-link:hover { background: var(--card); color: var(--text); }
.nav-link.active { background: var(--primary); color: #fff; }

.sidebar-footer { padding: 16px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 10px; }
.user-chip {
    padding: 8px 12px; background: var(--card); border-radius: 8px;
    font-size: 13px; color: var(--text-muted); text-align: center;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.main { flex: 1; margin-left: 250px; padding: 24px; }

.topbar {
    display: flex; align-items: center; gap: 16px;
    margin-bottom: 24px; flex-wrap: wrap;
}
.topbar h1 { font-size: 22px; font-weight: 700; flex: 1; }
.hamburger { display: none; background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 8px; color: var(--text); cursor: pointer; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 18px; border-radius: 8px; border: none;
    font-size: 14px; font-weight: 600; cursor: pointer;
    text-decoration: none; transition: background 0.15s, transform 0.1s;
    font-family: var(--font);
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost { background: transparent; color: var(--text-muted); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); background: var(--card); }
.btn-danger { background: transparent; color: var(--danger); border: 1px solid transparent; }
.btn-danger:hover { background: rgba(239,68,68,0.1); }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 10px; font-size: 13px; }

/* ---------- KPI ---------- */
.kpi-grid {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 16px; margin-bottom: 24px;
}
.kpi-card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px;
    display: flex; flex-direction: column; gap: 6px;
}
.kpi-label { font-size: 13px; color: var(--text-muted); font-weight: 500; }
.kpi-value { font-size: 32px; font-weight: 700; }

/* ---------- Chart ---------- */
.chart-card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px;
}
.chart-card h2 { font-size: 16px; margin-bottom: 16px; font-weight: 600; }
.chart-wrap { position: relative; height: 300px; }

/* ---------- Toolbar ---------- */
.toolbar { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.search-box {
    display: flex; align-items: center; gap: 8px;
    background: var(--card); border: 1px solid var(--border);
    border-radius: 8px; padding: 0 12px; flex: 1; min-width: 220px;
    color: var(--text-muted);
}
.search-box input {
    flex: 1; background: transparent; border: none; outline: none;
    color: var(--text); padding: 11px 0; font-size: 14px; font-family: var(--font);
}
.select {
    background: var(--card); border: 1px solid var(--border); color: var(--text);
    border-radius: 8px; padding: 10px 12px; font-size: 14px; cursor: pointer;
    font-family: var(--font); outline: none;
}

/* ---------- Table ---------- */
.table-card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); overflow: hidden;
}
.table-wrap { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th {
    text-align: left; padding: 14px 16px;
    color: var(--text-muted); font-size: 12px; text-transform: uppercase;
    letter-spacing: 0.05em; border-bottom: 1px solid var(--border);
    font-weight: 600; white-space: nowrap;
}
.data-table td {
    padding: 14px 16px; border-bottom: 1px solid var(--border);
    vertical-align: middle; white-space: nowrap;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tbody tr { transition: background 0.12s; }
.data-table tbody tr:hover { background: var(--card-hover); }
.empty { text-align: center; color: var(--text-muted); padding: 40px !important; }

.cell-main { font-weight: 600; }
.cell-sub { font-size: 12px; color: var(--text-muted); }

/* ---------- Badge ---------- */
.badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 4px 10px; border-radius: 999px; font-size: 12px; font-weight: 600;
}
.badge::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.badge-prospect { background: rgba(245,158,11,0.15); color: var(--warning); }
.badge-contact { background: rgba(6,182,212,0.15); color: var(--info); }
.badge-client { background: rgba(34,197,94,0.15); color: var(--success); }
.badge-perdu { background: rgba(239,68,68,0.15); color: var(--danger); }

/* ---------- Modal ---------- */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.6);
    display: none; align-items: center; justify-content: center;
    z-index: 100; padding: 20px;
}
.modal-overlay.open { display: flex; }
.modal {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); width: 100%; max-width: 560px;
    box-shadow: var(--shadow); max-height: 90vh; overflow-y: auto;
}
.modal-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 20px; border-bottom: 1px solid var(--border);
}
.modal-header h2 { font-size: 18px; font-weight: 700; }
.modal-close { background: transparent; border: none; color: var(--text-muted); cursor: pointer; padding: 4px; }
.modal-close:hover { color: var(--text); }
#client-form { padding: 20px; display: flex; flex-direction: column; gap: 14px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field label { font-size: 13px; font-weight: 600; color: var(--text-muted); }
.form-field input, .form-field textarea, .form-field select {
    background: var(--bg-soft); border: 1px solid var(--border); color: var(--text);
    border-radius: 8px; padding: 10px 12px; font-size: 14px; outline: none;
    font-family: var(--font); width: 100%;
}
.form-field input:focus, .form-field textarea:focus, .form-field select:focus {
    border-color: var(--primary);
}
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 6px; }

/* ---------- Toast ---------- */
.toast-container {
    position: fixed; top: 20px; right: 20px; z-index: 200;
    display: flex; flex-direction: column; gap: 10px;
}
.toast {
    padding: 13px 18px; border-radius: 8px; font-size: 14px; font-weight: 500;
    color: #fff; box-shadow: var(--shadow); animation: slidein 0.25s ease;
    max-width: 340px;
}
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
@keyframes slidein { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }

/* ---------- Auth ---------- */
.auth-body {
    display: flex; align-items: center; justify-content: center;
    min-height: 100vh; padding: 20px;
    background: radial-gradient(circle at 50% 0%, #1c2337 0%, #0f1420 70%);
}
.auth-card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: 16px; padding: 36px; width: 100%; max-width: 400px;
    box-shadow: var(--shadow); text-align: center;
}
.auth-logo {
    width: 64px; height: 64px; border-radius: 16px; margin: 0 auto 16px;
    background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center;
}
.auth-card h1 { font-size: 24px; font-weight: 700; }
.auth-sub { color: var(--text-muted); font-size: 14px; margin: 8px 0 24px; }
.auth-form { display: flex; flex-direction: column; gap: 8px; text-align: left; }
.auth-form label { font-size: 13px; font-weight: 600; color: var(--text-muted); margin-top: 8px; }
.auth-form input {
    background: var(--bg-soft); border: 1px solid var(--border); color: var(--text);
    border-radius: 8px; padding: 11px 12px; font-size: 14px; outline: none;
    font-family: var(--font); width: 100%;
}
.auth-form input:focus { border-color: var(--primary); }
.auth-form .btn { margin-top: 20px; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .kpi-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main { margin-left: 0; padding: 16px; }
    .hamburger { display: block; }
    .form-grid { grid-template-columns: 1fr; }
    .kpi-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
    .kpi-value { font-size: 26px; }
    .topbar h1 { font-size: 19px; }
}